EP4215869A1 - Conception d'un système structurel pour la vérification et l'étalonnage d'instruments de mesure - Google Patents

Conception d'un système structurel pour la vérification et l'étalonnage d'instruments de mesure Download PDF

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Publication number
EP4215869A1
EP4215869A1 EP22382037.4A EP22382037A EP4215869A1 EP 4215869 A1 EP4215869 A1 EP 4215869A1 EP 22382037 A EP22382037 A EP 22382037A EP 4215869 A1 EP4215869 A1 EP 4215869A1
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EP
European Patent Office
Prior art keywords
support
fibre
calibration
independent body
measuring instruments
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP22382037.4A
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German (de)
English (en)
Inventor
Iñigo ARIZAGA GURRUCHAGA
Unai MUTILBA LARREA
Gorka Cortaberria Berriozabal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fundacion Tekniker
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Fundacion Tekniker
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Publication date
Application filed by Fundacion Tekniker filed Critical Fundacion Tekniker
Priority to EP22382037.4A priority Critical patent/EP4215869A1/fr
Publication of EP4215869A1 publication Critical patent/EP4215869A1/fr
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G01B21/04—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness by measuring coordinates of points
    • G01B21/042—Calibration or calibration artifacts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/0011—Arrangements for eliminating or compensation of measuring errors due to temperature or weight
    • G01B5/0014—Arrangements for eliminating or compensation of measuring errors due to temperature or weight due to temperature

Definitions

  • the present invention refers to a system for the verification and calibration of measuring instruments, and specifically, refers to a length artefact for the calibration of measuring instruments.
  • the structural system design comprises a) a frame through which the load is transferred and b) a subsystem free of load that plays the role of a long-term dimensional reference.
  • the present invention shall be used as a long-term stable structure or framework, and it shall also be envisaged as a portable or large-scale structural system design principle.
  • the present invention refers to a dimensional artefact, in the sense of "material measure” that can be used as a measurement standard to establish traceability to the dimensional measurements performed by those measuring instruments to be verified or calibrated.
  • a “material measure” is defined in the International Vocabulary of Metrology (VIM) as a “measuring instrument reproducing or supplying, in a permanent manner during its use, quantities of one or more given kinds, each with an assigned quantity value", playing the role of a measurement standard which is defined at VIM as the "realization of the definition of a given quantity, with stated quantity value and associated measurement uncertainty, used as a reference”.
  • VIM International Vocabulary of Metrology
  • the present invention shall be used to perform a verification/calibration on the measuring instrument, where calibration is defined at VIM as "operation performed on a measuring instrument that establishes a relation between the values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties and uses this information to a relation for obtaining a measurement result from an indication".
  • VIM is defined as the provision of objective evidence that a given item fulfils specified requirements, in this case, shall it be a confirmation that a given reference material as claimed is homogeneous for the value and measurement procedure concerned.
  • the length artefact consists of a structure, and on its ends, it has the supports or holding elements for the arrangement of the fibre thread that plays the role of the so-called "material measure” as well as the nests employed to place the targets or define the touching points of the measuring instrument under verification/calibration. Considering its use, it shall be placed with multiple orientations in space to form a full 1D, 2D or 3D artefact. In the cases where the length of the dimensional artefact is important for its application, the recommended re-calibration periods should take into account prior knowledge about the long-term stability of its material.
  • the field of application of the present invention is framed within the field of precision engineering, metrology and dimensional calibration.
  • traceability to the SI means “metrological traceability to a measurement unit of the International System of Units”, is adopted as a cornerstone for manufacturing metrology, considering that traceable measurements provide the knowledge for correct decision making.
  • the documented unbroken chain of calibrations is often visualised by the so-called calibration pyramid, with the SI located at the top, followed by calibrations performed at national metrology institutes (NMIs), accredited calibration laboratories, and in-plant calibration laboratories, and finally by the manufacturing measurements and the manufacturing process control based on calibrated sensors, artefacts and measuring instruments, ensuring the traceability and comparability of measurement results.
  • NMIs national metrology institutes
  • the measurement uncertainty and the number of calibrated measuring instruments or measurement standards are increased at every step going down the calibration pyramid.
  • the objective of the present invention is to realize a large scale and portable "material measure” that tackles those limitations and outperforms those linear dimension artefacts employed traditionally, such as gauge blocks, step gauges, interferometry or ball bars. Understanding linear dimension artefacts as those providing a reference length defined as the distance between two reference points.
  • the object of the present invention is a structural system design for the calibration or performance verification of dimensional measuring instruments that comprises a) a frame through which the load is transferred and b) a subsystem free of load that plays the role of a long-term dimensional reference, according to claim 1.
  • a specific construction of the present invention is a length artefact for the calibration or performance verification of dimensional measuring instruments. Therefore, the present invention relates to a measurement standard, preferably portable, that permits realizing large-scale dimensional artefacts by tackling the main limitations of traditional length artefacts.
  • the length standard artefact includes a frame comprising
  • the length artefact itself will be the carbon fibre thread, whose length can be determined accurately through a calibration process and due to its low coefficient of thermal expansion, nearly zero, it will not be affected by variations in temperature and humidity that may affect the calibration scenario.
  • the fibre thread must be arranged on a support in a way that allows the fibre to be kept extended over its entire length.
  • the ends of the fibre are arranged on supports which in turn are placed on the ends of the elongated structure, which is slightly longer than the length of the thread.
  • Said supports are each arranged at one end of the structure. Specifically, one of the supports is fixed to the first end and the opposite support, the second support, is placed over the second end of the structure and connected to it through tension means, preferably a spring. Said tension means allow the movement of said second support concerning the said second end of the structure while maintaining the connection between both.
  • the fibre thread extends over the elongated body of the structure fixed to the first and second fibre supports, being the second support capable of moving concerning the second end of the structure.
  • All the components of the standard of the invention, except for the fibre thread are made of materials that can be affected by variations in temperature and humidity conditions. These variations can make the dimensions of the components change slightly, but said changes will not affect the length of the fibre thread because the same will remain tense.
  • the second support is movable concerning the second end of the structure. This happens because the length between the two ends of the structure is larger than the length of the fibre thread keeping said thread always tense due to the action of the tension means.
  • the tension means will absorb said changes to maintain the fibre thread tense.
  • the second fibre support comprises a base, between the structure and the support, that rests on the second end of the structure and allows said second support to slide on said second end.
  • the second end of the structure comprises a metallic surface where the lower base of the second fibre support rests.
  • Said second end can be metallic or comprise a metallic plate on the said end where the base of the support rests.
  • the lower base of said second support can comprise a magnet that will contribute to maintaining contact between said two components, the second support and the metallic surface of the second end, and at the same time allowing the sliding of the second support over the second end.
  • the first and second ends of the elongated body of the structure can comprise independent bodies coupled to the same or can be part of said structure.
  • the coupling means preferably screws, are used between the ends and the structure elongated body.
  • Said independent bodies are preferably the first fibre support element coupled to one end of the elongated body, acting as the first end, and a metallic body, or a body of a different material with a metallic plate, coupled to an opposite end of the elongated body, acting as the second end.
  • the first fibre support, placed on the first end of the structure, preferably matches with the first end of the structure, so that said first support is the first end of the structure.
  • the fibre supports can include clamping means to ensure the position of the fibre thread in the supports, preventing that the ends of the fibre thread move from their position.
  • the ends of the fibre thread can be coupled to the supports in different ways and different clamping means can be used to guarantee said coupling.
  • the elongated body is made of steel.
  • the support bodies are preferably made of steel and the clamping means too.
  • the material of the first end of the structure is preferably steel and the material of the second end of the structure is a metal such as steel, although other materials with a similar CTE could be used.
  • the system and artefact of the present invention are portable because they can be disassembled and transported or carried easily.
  • Figure 1 shows a perspective view of the system of the invention, specifically a length elongated structure (11), which comprises a frame (10) with two ends (1, 2) where preferably two fibre supports (40, 60)are placed, one on each end (1, 2) respectively.
  • a fibre thread (30) extends between said two fibre supports (40, 60) on the two ends (1, 2) of the elongated structure (11). This fibre thread (30) marks the distance for the calibration, which length remains constant due to its low coefficient of thermal expansion which is nearly zero.
  • the first support (40) is preferably placed on a first independent body attached and fixed to the first end (1) of the frame (10) ( Figs 6 and 7 ), and the second support (60) is connected to the second end (2) of the frame (10) through a second independent body (20), attached to said second end (2) of the structure (11) ( Figs. 2 to 5 ).
  • the second support (60) is connected to the second independent body (20) through an elastic tension element (80), preferably a spring or a similar element.
  • Said first support (40) is preferably said first independent body.
  • the fibre thread (30) remains with the same length and the tension element (80) acting as a tensor absorbs the deformation of said frame (10).
  • the force made on the fibre thread (30) due to the deformation of the tension element (80) is considerably lower than the stiffness of the fibre thread (30).
  • Figure 2 shows a side view of the second end (2) of the elongated structure (11) with the second support (60) on the second independent body (20) on the second end (2) of the elongated structure (11).
  • the second support (60) preferably comprises a clamping element (70) to ensure the position of the fibre thread (30) in the second support (60), preventing that the end of the fibre thread (30) moves from its position.
  • the end of the fibre thread (30) can be coupled to the second support (60) in different ways and different clamping means can be used to guarantee said coupling.
  • the second support (60) is attached to the second independent body (20) of the frame (10) through the tension element (80) acting as a tensor.
  • the fibre thread (30) is therefore fixed on the second support (60) and this one is flexibly linked to the frame.
  • the tension of this elastic and flexible link is always lower than the rigidity of the fibre thread (30).
  • the tension element (80) must have some initial tension, so the fibre thread is tense from the start, to absorb the displacement in both directions of the possible elongation of the frame (10) due to temperature or humidity.
  • the components of the frame (10), the first and the second independent bodies (40, 20) are made of steel.
  • the second support (60) is preferably made of steel too as well as the coupling element (70). Other materials different to the steel but with a similar CTE could be used.
  • Figure 3 shows a section of figure 2 .
  • the fibre thread (30) is clamped to the second support (60) with the clamping element (70), acting as a cover, with an orifice (71).
  • This clamping element (70) is coupled to the second support (60) with a screw that goes through the orifice (71) in the clamping element (70) and is screwed to the threaded orifice (62) in the second support (60).
  • Said second support (60) comprises a groove (61) where the end of the fibre thread (30) is engaged.
  • the clamping element (70) has a projection, complementary to the groove (61) that is introduced in the said groove (61) clamping the fibre thread (30) between the second support (60) and the clamping element (70).
  • the tension element (80) or spring is coupled to the second support (60) through one of its ends and to a protrusion (21) in the second independent body (20) through its opposite end.
  • the ends of the tension element (80) are preferably fixed to the second support (60) and to the protrusion (21) with screws.
  • the screw (25) crosses through the end of said tension element (80) that is introduced in the protrusion (21) through an orifice or window (24). This window (24) allows slight lateral movements of the tension element (80) concerning the protrusion (21) of the second independent body (20) of the frame (10).
  • a similar construction for allowing slight movements of the tension element (80) exists on the second support (60).
  • the second support (60) comprises a lower base that rests on a surface of the second independent body (20) comprising said base a fixing element, such as a magnet (90).
  • Said magnet (90) joins the second support (60) with the second independent body (20) of the frame (10) but allowing said second support (60) to scroll along the direction of the tension of the fibre thread (30).
  • the magnet (90) prevents the second support (60) from falling from the second independent body (20) if the system or elongated structure (11) is used vertically.
  • the interface of the second support (60) with the second independent body (20) is made by a roulement so there is no friction force between the two, in case of displacement of the support (60).
  • the material of the second independent body (20) should allow the attraction of the magnet (90).
  • the second independent body (20) is coupled to the frame (10) with a screw that first crosses said second independent body (20) through an orifice (23) and afterwards is introduced onto the frame (10).
  • Figure 4 shows a perspective view of the second support (60) on the second end (2) of the elongated structure (10) without the clamping element (70).
  • the second support (60) with the groove (61) and the fibre thread (30) inside, as well as the tension member (80) coupled to the protrusion (21) through the window (24) with the screw (25), can be seen in said figure 4.
  • Figure 5 shows a perspective view of the second support (60) on the second end (2) with the cover (70), which contributes to fix the fibre thread (30) to the second support (60).
  • Figures 6 and 7 show perspective views of the first end (1) of the artefact, without a clamping element (70) and with the clamping element (70) respectively.
  • the first support of the fibre thread (30) is also the first independent body (40) of the first end (1) of the frame (10).
  • a support and independent body as the ones in the second end (2) of the frame (10) could be used too in the first end (1).
  • a first support would be connected to a first independent body of the frame (10), being the first support and first independent body two separate elements.
  • the first support (40) or first independent body comprises a groove (41) where the end of the fibre thread (30) is introduced.
  • the clamping element (70) is placed on said first support (40) or first independent body and coupled to the same through a screw, crossing said clamping element (70), and introduced into an orifice (42) in said first support (40) or first independent body.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
EP22382037.4A 2022-01-21 2022-01-21 Conception d'un système structurel pour la vérification et l'étalonnage d'instruments de mesure Withdrawn EP4215869A1 (fr)

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EP22382037.4A EP4215869A1 (fr) 2022-01-21 2022-01-21 Conception d'un système structurel pour la vérification et l'étalonnage d'instruments de mesure

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EP22382037.4A EP4215869A1 (fr) 2022-01-21 2022-01-21 Conception d'un système structurel pour la vérification et l'étalonnage d'instruments de mesure

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EP4215869A1 true EP4215869A1 (fr) 2023-07-26

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6246244B1 (en) * 1995-11-13 2001-06-12 Nanotec Solution Method and device for measuring axial deviation in a taut wire alignment system
CN101942903B (zh) * 2010-08-16 2012-03-07 合肥工业大学 预张拉碳纤维板加固混凝土梁板的装置及施工方法
US20210025702A1 (en) * 2019-07-22 2021-01-28 Brunson Instrument Company Articulating arm calibration artifact system and method of use

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6246244B1 (en) * 1995-11-13 2001-06-12 Nanotec Solution Method and device for measuring axial deviation in a taut wire alignment system
CN101942903B (zh) * 2010-08-16 2012-03-07 合肥工业大学 预张拉碳纤维板加固混凝土梁板的装置及施工方法
US20210025702A1 (en) * 2019-07-22 2021-01-28 Brunson Instrument Company Articulating arm calibration artifact system and method of use

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BOJAN ACKO ET AL: "Paper;Standards for testing freeform measurement capability of optical and tactile coordinate measuring machines;Standards for testing freeform measurement capability of optical and tactile coordinate measuring machines", MEASUREMENT SCIENCE AND TECHNOLOGY, IOP, BRISTOL, GB, vol. 23, no. 9, 25 July 2012 (2012-07-25), pages 94013, XP020228643, ISSN: 0957-0233, DOI: 10.1088/0957-0233/23/9/094013 *

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